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[metal] Add a uprintf() routine, for non-emergency boot logging (#905)

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* [metal] Add a uprintf() routine, for non-emergency boot logging
* [metal] _Really_ push forward timing of VGA TTY initialization
* [metal] Do something useful with uprintf()
* [metal] Locate some ACPI tables, for later hardware detection

Specifically the code now tries to find the ACPI RSDP,
RSDT/XSDT, FADT, & MADT tables, whether in legacy BIOS
bootup mode or in a UEFI bootup.  These are useful for
figuring out how to (re)enable asynchronous interrupts
in legacy 8259 PIC mode.
This commit is contained in:
tkchia 2023-10-26 05:32:20 +08:00 • committed by GitHub
parent 062b2d776e
commit ed17d3008b
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25 changed files with 999 additions and 36 deletions
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2
libc/integral/c.inc
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@ -728,6 +728,8 @@ void abort(void) wontreturn;
#endif
#define __weak_reference(sym, alias) \
__weak_reference_impl(sym, alias)
#define __weak_reference_impl(sym, alias) \
__asm__(".weak\t" #alias "\n\t" \
".equ\t" #alias ", " #sym "\n\t" \
".type\t" #alias ",@notype")